Mechanism for changing rotary into reciprocating motion.



PATBNTED NOV. 8,.1904. E. RIVETT. MECHANISM FOR CHANGING ROTARY INTO RBGIPROCATING MOTION.

.nnzoulol nun rm; :0, '1904.

I0 IODEL.

Patented November 8. 1305.

UNITE STATES PATENT OFFICE.

EDWARD RIVETTQO'F lriOSTON. 1i.lS5ACIIl.TSE'lTS.

MECHANISM FOR CHANGlh'G RGTARY lNTO REClPROCATll -YG MOTION.

SPECIFICATION forming part of Letters Patent No. 774,496, dated November 8, 1904.

Application filed February 10, 1904. Serial No.

192,901. tile model.)

To all whom, it m n- 1 concern:

Be it known that I EDWARD Rive'rr. a citizen of the United St tes. residing at Boston, in the county of Sutloll; and State of Massachusetts, have invented an Improvement llr Mechanism for Changing Rotary into Reciprocating Motion, of which the following description, in connection with the accon'many ing drawings. is a specification. like characters on the drawings representing like parts.

' This invention has for its object the pro-duction of novel means for producinga reciproeating movement from a. rotating moveh int. the invention being applicable for use in any class of machinery wherein it is desired to reciprocate a part for various distances.

In accordance with this invention 1 mount a slide in suitable guidewavs and move the same to and fro through a lever connected at one end with said slide and having a contact. against which strikes a cam as the latter rotated, and according to the positionor' the contact with relation to the fulcrum of the lever I may \Zfil) the throw of the slide.' The reciprocating movement of the slide may be at a uniform speed in one and then inthe opposite direction, or it may be moved. in one direction at a faster speed and in the opposite direction at a slower speed, that depending upon the class of work being done and the shape in cross-section of the actuating-cam.

Figure 1 shows a suilicient portion of an apparatus embodying my invention to illustrate the same in one practical form. Fig. 1 is a detail to be referred to. Fig. 2 isja detail looking at the right-hand side of the lci'f'er and its journals. Fig. 3 is a left-hand endview of Fig. 1. the frame being broken out." Fig. 4 is an enlarged detail in the line (1:; Pg. 1. Fig. :3 is a section below the line ask-Fig. 1. Fig. 6 is an under side View of part of the platen, and Fig. 7 a modification showing a cam for-imparting a slow movementin one direction and a rapid movement in theyopposite direction. l Referring to the drawings, Areprcsents the lower portion or base of the fl'tl l-IilrVOllC with which] have incorporated my invention, the upper portion of said frame ork sustaining an auxiliary frame A, having its {upper end A shaped s shown in Fig. 4 to, receive and guide a carriage or platen A of an usual construction and commonly employed in 71M- chines for doing ditl'ereut. classes of work. The upper end A is shown as tapered at its edges to fit a groove of correspomling shape in the under side of the carriage or platen. The upper portion A" referred to isshaped as represented in Fig. 4 or in other-suitable.

manner to receive and guide slide B and direct the same in its movements in a straigjzt line, the shdc and portion A being connc. l

by a tongue and groove.

The upper portion of the slide iihas a d iver tailed project-ion any portion of which with relation to its lengthma; he sped invad nr. best shown in Fig. 4 as cour having a PlQltCllOIl sha ed .o lit one :i the projection said har Ming extend d. as represented at '1". and threaded to receive a handled um '1". Before applying the hai'zrlhn nut to the bar I mount h Jselv thereon a coopcratxing projection If, and thereafter b applying the nut to the bar and rotating tinsame the projections of the bar may be made .to clamp firmly the projection of the slide.

so that the carriage or platen will partake of the movement of the slide. By turning the nut If in one direction the projection of the bar may be made to instantly release the. projection of the slide, leaving the carriage or platen at rest. that it may he moved by hand into any desired position. as when. for instance, adjustingor trying the position of the carriage or platen with relation to th tool or other device to be used in the machine in which my invention is embodied. whether a grinder, a planer. or an machine wherein a reciprocatingmovement is desired. By embracing the projection 6 on both sides when clampi'n; the carriage or platen to the slide there. is no liabilitv of springing or distorting theczu'riagc or slide, as would be the ca e if a screwwere used acting upon one side of the projection i through a shim or otherwise.

The portion of the base sustaim on a suitable fulcrum 11" a lever (j, shown ass-having its lower end L"- shaped to constitute tn 0 tracks 1!. The lever sustains-a bt'illlllg hlfllik 1/. through which are extended twosrrmvs n,

-whieh wheels are engaged by bevel-wheels a with some portion of the framework.

- moved uniformly.

on a shaft (1 having its axis coincident with the turning-point or fulcrum of the lever f. The screws .1 a fit threaded portions 91 a contact-carrier 1', the ends of which are shaped (see Fig. 5) to embrace and ride on tracks at, formingpart of the lower end C of the lever.' The contact-carrier has pivoted upon it at 2 a block 1], that receives a stud 3, that sustalus looselya contact 1], shown as a roller. One end of the lever C is joined by a iink C with a depending leg 4 of the slide.

The framework sustains suitable arms 5, that are provided with bearings for a shaft e, on which 15 fixed a cam a. said shaft having also fixed to it a toothed gear a, that is engaged by a pinion eon a shaft having.

at its upper end a bevel-wheel e that is engiged and rotated bva bevel-gear e on a short shaft a, said shaft being driven constantly from any suitable counter-shaft or shaft of the machine, so that the cam 0 is Thecam 0 Figs. 1 and 5-. is in cross-section a substantially perfect heart, and as itis rotated it'will act on the contact d and turn the lever Cabout its fulcrum, so as to move the slide and any part connected therewith, as the carriage or platen, forward and backward at just the same speed; but the length of the stroke may be varied by changing the position of the contact-with relation to the endsof the cam/f. "foeti'cct this, it is only necessary to rotate the shaft a, which may be done either by a key fastened upon a squared end of the shaft, or said shaft may be rotated slowly at any desired speed by any usual or 'suitable meanssuch, for instance, as a worm-wheel m engaging a worm-m on the shaft (1 as shown in the detail Fig. 1. As. the contact is moved downwardly from the position Fig. 1 toward the smaller diameter of the cam 0 the stroke is gradually made shorter. By shaping the cam in cross-section as represented in F ig. 7 the stroke of the slide in one direction may be made slowly, and arriving at the end of its stroke the return stroke may be made rapidly-a.s, for instance, in planers, where it is desired to vary the work slowly under the tool and bring it back rapidly when the tool is not doing work.

To keep the contact against the periphery of the cam, I employ a spring f, connected with some portion of the lever below its pivot,

the opposite end of the spring being connected To counterbalance the weight of the lever and its friction on its pivot, I employ a second connterbalancingspring J", said springs being preferably of the same strength.

Having described my invention. what I claim, and desire to secure by Letters Patent,

1. In an apparatus for controlling motion. a lever, means connected with one end of said lever to be reciprocated thereby, a carrier mounted on said lever and provided with a loosely-sustained contact, means carried by said lever to adjust said carrier, a cam, means to rotate said cam that it acting on said contact may turn said lever more or less according to the position of the carrier and contact on said lever. I

2. In an apparatus for controlling motion, a slide, means to sustain said slide, a pivoted lever connected with said slide and provided with a carrier having aloosely-sustained contact, means to move said carrier on said lever, a tapered cam, means to revolve said cam that it may strike said contact and move said lever and slide for a greater or less distance according to the part of the cam acting upon said contact.

3. In an apparatus of the class described, a frame havinga guideway, a slide entering said guideway and having a dovetailed projection, means to reciprocate said slide, a carriage havinga groove, a clamp having opposed jaws, and arranged in said groove and embracing the opposite sides of said projection, and means to close and open at once the jaws of said clamp. as it is desired to move said carriageor leave it at rest.

4. A lever, means connected with one end of said lever, to be moved therel) v,'a carrier having a loosely-sustained contact, a screw sustained by said lever and engaging said carrier, a tapered cam, means to rotate said earn about its longitudinal axis, means to turn said screw to adjust said carrier longitudinally of said lever that itmay be met by any desired part of said cam to thereby control the extent of movement of said lever and the part to be moved thereby.

5. A lever having tracks, means connected with one end of said lever to be moved thereby, a carrier embracing fsaid tracks and having a pivoted block provided with a roller, screws engaging said carrier, means to rotate said screws to slide said carrier on said tracks, a tapered cam, and means to rotate the same, said cam moving said lever for a greater or less distance according to the part of the cam against which said roller bears.

In testimony whereof I have signed my name 

